Article
Geochemistry & Geophysics
Riikka Fred, Jussi S. Heinonen, Aku Heinonen, Wendy A. Bohrson
Summary: The development of computational modeling tools has revolutionized the study of magmatic processes. This research focuses on the origin and petrogenesis of massif-type anorthosites using thermodynamically constrained modeling tools, and provides valuable insights into the processes involved.
Article
Multidisciplinary Sciences
Rong-Feng Ge, Simon A. Wilde, Wen-Bin Zhu, Xiao-Lei Wang
Summary: The formation of continental crust has had a significant impact on the surface and interior of our planet, creating the land and mineral resources that we rely on. By studying the magmatic oxygen fugacity (fO(2)) and H2O content of Archaean granitoids, researchers have found that these rocks were more oxidizing than ambient mantle-derived magmas and had high magmatic H2O contents and H2O/Ce ratios. These observations support the role of subduction in crustal formation.
Article
Geochemistry & Geophysics
Michelle J. Muth, Paul J. Wallace
Summary: This study investigates the sulfur content of arc magmas from different subduction zones using olivine-hosted melt inclusion data from 32 arc segments globally. The results show that arc magmas generally have higher sulfur contents compared to mid-ocean ridge basalt, and the sulfur is partially sourced from the subducting slab.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jean-Guillaume Feignon, Nicolas Cluzel, Federica Schiavi, Severine Moune, Olivier Roche, Jorge Clavero, Pierre Schiano, Marion Auxerre
Summary: Mocho-Choshuenco volcano is one of the most hazardous volcanoes in the southern volcanic zone of Chile, but it is still relatively little studied. A study of the 1600-year-old Enco eruption revealed that it was triggered by the mixing of a CO2-rich basaltic magma with a shallower andesitic magma.
BULLETIN OF VOLCANOLOGY
(2022)
Article
Geology
J. Neukampf, B. S. Ellis, O. Laurent, L. K. Steinmann, T. Ubide, M. Oeser, T. Magna, S. Weyer, O. Bachmann
Summary: The study reveals that volatile degassing before volcanic eruptions occurs in a short period of tens of minutes, with rapid changes in lithium isotopic and elemental concentration profiles in plagioclase crystals. This new technique has the potential to improve the interpretation of volcanic monitoring signals and enhance the safety of people living near active volcanoes.
Article
Geochemistry & Geophysics
I. P. Solovova, M. A. Yudovskaya, J. A. Kinnaird, A. H. Wilson, N. G. Zinovieva
Summary: The study analyzed primary melt inclusions in olivine from the Uitkomst Complex in the Bushveld Igneous Province, showing that their compositions are the result of combined fractional crystallization and assimilation. The most primitive melt within the series is characterized by high temperatures and specific mineral compositions. The study also suggests a common source of ultramafic melts in the Bushveld Province.
Article
Multidisciplinary Sciences
Carter Grondahl, Zoltan Zajacz
Summary: This study evaluates the large-scale covariation of key ore-forming constituents in the Andean Southern Volcanic Zone by studying silicate melt inclusions in volcanic rocks. The abundance of chlorine and sulfur, rather than the abundance of ore metals, controls magmatic ore fertility. The loss of volatiles prior to arrival in the upper crust impacts ore-forming potential more than magmatic sulfide saturation-related ore metal scavenging.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Matthew L. M. Gleeson, Sally A. Gibson, Michael J. Stock
Summary: Despite their low concentration in most oceanic basalts, volatile species have a significant influence on mantle and magmatic processes. This study demonstrates the possibility of reconstructing the volatile content history of basaltic magmas by integrating multiple volatile records.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Simone Costa, Paolo Fulignati, Anna Gioncada, Marco Pistolesi, Delphine Bosch, Olivier Bruguier
Summary: The mineralization potential of arc magmas is influenced by the timing of sulfide melt saturation and exsolution of a magmatic fluid phase. Analysis of eruptive products from the active arc volcano, La Fossa, reveals that metals reach highest abundances in intermediate magmas due to sulfide saturation. The mechanisms governing metal evolution in porphyry Cu systems can be tracked using eruptive products as snapshots of magmatic evolution.
Article
Geosciences, Multidisciplinary
B. M. Urann, V. Le Roux, O. Jagoutz, O. Muntener, M. D. Behn, E. J. Chin
Summary: According to geochemical analyses, the water content of arc magmas can reach up to 20 wt% in the lower crust, highlighting the importance of water in the formation of porphyry deposits. By measuring volatile abundances in lower-crustal cumulate minerals, researchers have found that pyroxenes retain the water content of the magmas and record a range of water contents in primitive melts. Subsequent crystal fractionation results in the formation of super-hydrous melts with a water content of approximately 12-20 wt%, which have been rarely observed in previous studies.
Article
Environmental Sciences
Emily C. Bamber, Giuseppe La Spina, Fabio Arzilli, Mattia De' Michieli Vitturi, Margherita Polacci, Margaret E. Hartley, Maurizio Petrelli, Jonathan Fellowes, Mike Burton
Summary: This study quantifies the geochemistry and volatile concentrations of basaltic Plinian eruptions in Nicaragua and identifies the conditions conducive to such eruptions. It finds that a pre-eruptive temperature below 1100 degrees C and a total crystal content above 30 vol.% are the most favorable conditions for basaltic Plinian eruptions. The study also highlights the potential volcanic hazard posed by cooling, crystal-rich, large-volume basaltic magma bodies.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Daniel J. Rasmussen, Terry A. Plank, Diana C. Roman, Mindy M. Zimmer
Summary: Efforts in forecasting volcanic eruptions are now focusing on physics-based models that require accurate estimation of magma conditions prior to eruption. Observed magma storage depths below active volcanoes vary widely and have commonly been assumed to represent neutral buoyancy levels, but our research shows that geophysically observed depths are greater than neutral buoyancy depths and are consistent with depths of water degassing. The relationship between water depth and magma provides a critical constraint for forecasting models.
Article
Geology
Ivan F. Chayka, Vadim S. Kamenetsky, Kreshimir N. Malitch, Yury R. Vasil'ev, Michael E. Zelenski, Adam B. Abersteiner, Ivan A. Kuzmin
Summary: Ultramafic-alkaline-carbonatite complexes (UACC) are important resources of various metals and have been formed through magmatic differentiation and post-magmatic hydrothermal processes. However, our understanding of the pathway from primitive melt to ore deposit is still incomplete.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Jingyi Deng, Jiankang Li, Dehui Zhang, I-Ming Chou, Qinggao Yan, Xin Xiong
Summary: This study analyzes melt inclusions in granitic pegmatites from a world-class deposit in eastern China, demonstrating that pegmatitic melts may originate from melt-melt immiscibility in granitic magmas. This research is significant for understanding the origin and formation mechanism of pegmatite deposits.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Multidisciplinary Sciences
Si-Yu Zhao, Alexandra Yang Yang, Charles H. Langmuir, Tai-Ping Zhao
Summary: Arc volcanics are more oxidized than mid-ocean ridge basalts, and this may be a result of mantle melting. The variations in copper content in arc volcanics indicate differences in sulfur content, oxygen fugacity, and mantle melting. The copper systematics of the sub-arc mantle require higher oxygen fugacities, and the low copper content in thick-crusted arc volcanics may be due to low melting of sulfur-rich mantle.
Article
Geochemistry & Geophysics
Alexander A. Iveson, Madeleine C. S. Humphreys, Ivan P. Savov, Jan C. M. de Hoog, Stephen J. Turner, Tatiana G. Churikova, Colin G. Macpherson, Tamsin A. Mather, Boris N. Gordeychik, Lubomira Tomanikova, Samuele Agostini, Keiji Hammond, David M. Pyle, George F. Cooper
Summary: The chemistry of primitive arc rocks provides insights into the compositional variability in the mantle wedge and slab-derived inputs to subduction-related magmatism. By analyzing olivine-hosted melt inclusions from the Kamchatka arc, systematic variations in element ratios are observed, which provide evidence for subduction-related metasomatism and mantle melting degrees. Across-arc variations in B isotopes reflect variable contributions of slab-derived components to depleted mantle compositions, with signals of compositional heterogeneity preserved during magma assembly and storage in the crust.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Euan J. F. Mutch, John Maclennan, Oliver Shorttle, John F. Rudge, David A. Neave
Summary: The DFENS method combines finite element numerical model and Bayesian inversion to reduce uncertainties in diffusion timescales; analyzing products of the Baroarbunga volcanic system in Iceland with this method reveals olivine and plagioclase provide mixing and disaggregation timescales of less than 1 year.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Cristina Accotto, David Martinez Poyatos, Antonio Azor, Cristina Talavera, Noreen Joyce Evans, Antonio Jabaloy-Sanchez, Ali Azdimousa, Abdelfatah Tahiri, Hassan El Hadi
Summary: The U-Pb dating and Hf isotopic analyses of detrital zircon grains from Cambrian-Devonian strata in the Moroccan Mesetas provide insights into the Paleozoic paleogeographic evolution. The presence of significant detrital zircon populations from various ages suggests the main sediment source for northern Morocco was the West African Craton. The collisional evolution began with the approach of an Avalonian promontory to the northern Gondwana continental margin, resulting in the formation of a magmatic arc in the upper plate.
Article
Geosciences, Multidisciplinary
Sebastian Fischer, Anthony R. Prave, Tim E. Johnson, Peter A. Cawood, Chris J. Hawkesworth, Matthew S. A. Horstwood
Summary: The study focuses on the zircon record of high-grade gneiss terrains, particularly on metamorphosed mafic rocks and their in situ leucosomes. By analyzing the metamorphic ages of mafic migmatites in the central region of the Lewisian complex, it is found that the age clusters are similar across disparate terrane blocks, suggesting a common pre-metamorphic history and questioning the validity of the terrane model. Mafic lithologies provide valuable insights into the complex evolution of metamorphic complexes and offer additional context for understanding Earth's geodynamic evolution.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Z. Taracsak, D. A. Neave, P. Beaudry, J. Gunnarsson-Robin, R. Burgess, M. Edmonds, S. A. Halldorsson, M-A Longpre, S. Ono, E. Ranta, A. Stefansson, A. Turchyn, M. E. Hartley
Summary: This study investigates matrix effects that arise during sulfur isotope analysis of glasses by SIMS, using over 600 sulfur isotope analyses of nine different glasses. The research reveals a nonlinear correlation between glass sulfur content and IMF, and demonstrates that models incorporating multiple elements can accurately predict instrumental mass fractionation. This highlights the importance of using well-characterized standards with a wide compositional range to calibrate SIMS instruments for sulfur isotope analyses of unknown silicate glasses.
Article
Geochemistry & Geophysics
Penny E. Wieser, Marie Edmonds, Cheryl Gansecki, John Maclennan, Frances E. Jenner, Barbara Kunz, Paula Antoshechkina, Frank Trusdell, R. L. Lee
Summary: The 2018 eruption of Kilauea Volcano in the Lower East Rift Zone (LERZ) involved a series of fissures erupting magmas with varying compositions. The magmas underwent extensive fractional crystallization, resulting in viscous and volatile-rich melts. Chemical analysis of the erupted products revealed the presence of a magma reservoir at a depth of about 2-3 km. These findings highlight the potential for hazardous explosive eruptions in ocean island volcanoes.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Matthew L. M. Gleeson, Sally A. Gibson, Michael J. Stock
Summary: Despite their low concentration in most oceanic basalts, volatile species have a significant influence on mantle and magmatic processes. This study demonstrates the possibility of reconstructing the volatile content history of basaltic magmas by integrating multiple volatile records.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Alberto Ceccato, Luca Menegon, Lars N. Hansen
Summary: The yield strength of quartz LTP under room temperature, high-stress conditions seems to be unaffected by the intracrystalline H2O content.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
M. J. Turuani, A. T. Laurent, A. -m. Seydoux-Guillaume, D. Fougerouse, D. Saxey, S. M. Reddy, S. L. Harley, S. Reynaud, W. D. A. Rickard
Summary: The discordance of U-Th-Pb isotopic systems in geochronometers and their interpretation remain major issues. This study investigated the discordant monazite from the Napier Complex in Antarctica to understand the relationship between discordance and the preservation of Pb*-bearing nanocrystals. The results highlight the potential of nanoscale studies of monazite to provide important details of the thermal history of complex metamorphic terranes.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
B. J. R. Harris, J. C. M. de Hoog, R. Halama
Summary: In situ measurements of nitrogen in silicate minerals reveal that white mica is the primary host for nitrogen, while other minerals such as clinopyroxene, amphibole, and epidote have lower nitrogen concentrations. Chlorite may also play a role in the nitrogen cycle in subduction zones. The findings provide important insights into the behavior of nitrogen during fluid-rock interactions and the migration of nitrogen in subduction zones.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Olivier Reubi, Othmar Muntener
Summary: Andesites are representative of subduction zone magmatism, but intermediate magmas are less abundant than generally thought in arc settings. Polybaric crystallization-differentiation plays an important role in producing the compositional range and relative abundance of arc melts, while mixing is also a major factor in the production of andesitic magmas.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Alexander A. Iveson, Madeleine C. S. Humphreys, Frances E. Jenner, Barbara E. Kunz, Ivan P. Savov, Jan C. M. De Hoog, Tatiana G. Churikova, Boris N. Gordeychik, Samantha J. Hammond, Pavel Yu Plechov, Jon Blundy, Samuele Agostini
Summary: This study investigates the magma generation and storage processes in the Tolbachik volcanic field, Russia, and explores the evolution of volatile phase and enrichment of chalcophile metals, particularly copper (Cu). The research reveals spatially variable magma storage conditions and different volatile contents and degassing histories for magmas feeding different monogenetic cones. The study also demonstrates that the Tolbachik volcanic field has a unique enrichment in Cu compared to other volcanoes in the region.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Jan C. M. De Hoog, Eleri Clarke, Keiko Hattori
Summary: Boron is an effective tracer of fluid processes in subduction zones, and olivine has the ability to scavenge significant amounts of boron from fluids at sub-arc pressures and temperatures. Transport of slab-derived material to magma sources requires processes with minimal interaction with mantle peridotite due to the abundance of olivine in the mantle wedge.
Article
Geochemistry & Geophysics
Benedict J. R. Harris, Jan C. M. De Hoog, Ralf Halama, Hans-Peter Schertl, Yi-Xiang Chen
Summary: This study investigates the sources and timing of fluid infiltration in the whiteschists from the Dora-Maira massif in the Western Alps. It utilizes boron isotopes and other fluid-mobile trace elements in phengite to understand the metasomatic fluid influx. The results suggest that a B-rich sediment-derived fluid is the main source of B in the whiteschists, while the source of the Mg-rich fluids cannot be determined. This study demonstrates the usefulness of in situ analyses in unraveling complex fluid-rock interaction histories.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Andre N. Paul, Joseph A. Stewart, Samuele Agostini, Linda A. Kirstein, Jan C. M. De Hoog, Ivan P. Savov, Kristina Walowski, James W. B. Rae, Tim Elliott
Summary: This study presents a low-blank sample preparation procedure for boron isotope measurement in silicate rocks using MC-ICP-MS. The method effectively addresses the challenges of volatilisation during silicate dissolution and contamination during chemical purification. The results demonstrate the accuracy and consistency of the method and reveal the heterogeneity in boron isotopes in the upper mantle.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
